Elevated Serum Chromogranin A Concentrations in Small-Cell Lung Carcinoma

Abstract

Serum chromogranin A concentrations measured by radioimmunoassay in patients with small-cell lung carcinoma were compared with values from healthy adults and paitents with non-small-cell lung carcinoma or chronic obstructive pulmonary disease. The mean (.+-. SE) level was significantly higher (p < 0.02) in patients with small-cell lung carcinoma (815 .+-. 290 ng/mL, n = 46) than in normal controls (123 .+-. 6 ng/mL, n = 20) or patients with chronic obstructive pulmonary disease (169 .+-. 18 ng/mL, n = 39), lung adenocarcinoma (180 .+-. 22, ng/mL, n = 62), large-cell lung carcinoma (183 .+-. 23 ng/mL, n = 18), or lung epidermoid carcinoma (203 .+-. 37 ng/mL, n = 78). The mean concentration in extensive-stage small-cell lung carcinoma (1155 .+-. 449 ng/mL, n = 29) was significantly greater (p = 0.026) than in limited disease (234 .+-. 56 ng/mL, n = 17). Elevated serum chromogranin A values were seen in 53% of patients with limited and 72% with extensive disease. Four patients originally classified as having non-small-cell lung carcinomas with raised chromogranin A levles were subsequently found to have mixed small-cell and non-small-cell tumors. Serum chromogranin A concentrations may be a useful marker of small-cell lung carcinoma disease activity.